[Leif_-]

Right, I've attached a small example like you asked for (except I used 90% rather than 10% to make sure I could see if it was working.)

Now, to your questions.

I don't quite understand your first question. If you're thinking about running two theme files in sequence to get a "combined theme," then no, you can't do that. The program only reads topographical information from the original .map file; it ignores anything else.

No, the program is unchanged since Dominions 2, and doesn't support new terrain types. However, it always refers to units by number, not name, so it will automatically support new units. (If any of the old units have changed number in Dom3 the old .ran files might be wrong, but the actual program itself doesn't need to be changed.)

A list of all magic items and sites would be useful.

Edit: Now with attachment.